Simple, short and effective. The sketchy look grew on me so much I'm almost sad to hear they're gonna be replaced by fully detailed artwork. I don't mind that at all of course, but I don't know, there's something with those sketches that really catches me, perhaps the fact my mind has to fill the gaps itself makes it more endearing?
Something a bit unecessary, but it's weird the game doesn't tell you about the "Fuck" button at the bottom left of the screen. It lets you switch between work and fuck mode to make their respective meters fill faster. I know players are gonna end up clicking on them eventually just to see what they do, but it's weird they didn't make it clear upfront with some short text or tooltip.
With more content I can definitely see this one getting big, it's also made by a big player in the adult scene, so I can only see future success for this game.